COMPUTED FREQ VARIATION IN QUICK_PIT_CALIBRATE() LEADS TO INACCURATE SYSTEM TIME (Doc ID 1611775.1)

Last updated on OCTOBER 08, 2015

Applies to:

Linux OS - Version Oracle Linux 5.5 with Unbreakable Enterprise Kernel [2.6.32] and later
Linux x86-64
Linux x86

Symptoms

The system initially works without issues, but after a reboot starts experiencing large time drifts (e.g. drifts of 2-3 seconds per elapsed minute when compared with correct time). The drift can exceed NTP's maximum tolerance of 500 PPM, which means NTP may not be able to compensate for the drift. No other hardware or software issues besides the time drifts in system clock are observed.

After reboot, the following message is no longer issued:

"Refined TSC clocksource calibration:"

Whereas, before reboot this message is issued, e.g: a message similar to the following should be logged on a working system after it is rebooted:

 

Cause

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